getSlaveServer.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class GetSlaveServer extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->addOption( "group", "Query group to check specifically" );
                $this->mDescription = "Report the hostname of a slave server";
        }
        public function execute() {
                global $wgAllDBsAreLocalhost;
                if ( $wgAllDBsAreLocalhost ) {
                        $host = 'localhost';
                } elseif ( $this->hasOption( 'group' ) ) {
                        $db = wfGetDB( DB_SLAVE, $this->getOption( 'group' ) );
                        $host = $db->getServer();
                } else {
                        $lb = wfGetLB();
                        $i = $lb->getReaderIndex();
                        $host = $lb->getServerName( $i );
                }
                $this->output( "$host\n" );
        }
}

$maintClass = "GetSlaveServer";
require_once( RUN_MAINTENANCE_IF_MAIN );